"Not all s evolve at the same rate, some early species were actually so well adapted that they competed successfully against newer species. are so well suited to life in oceans, lakes, and streams that they still thrive even though most features present in modern, living algae must be more or less identical to those present in the ancestral algae that lived more than 1 billion years ago. Features that seem relatively unchanged are relictual features (technically known as , formerly called primitive features). Like the algae, s are well-adapted to certain habitats and have not changed much in 250 million years; they too have many relictual features. Modern conifers are similar to early ones that arose around 320 millions years ago. The most recently evolved group consists of the flowering plants, which originated about 100 to 120 million years ago with the evolution of several features: flowers, broad, flat, simple leaves, and that conducts water with little friction. The members of the (sunflowers, daisies, and s) ... have many features that evolved recently from features present in ancestral flowering plants. These are derived features (technically known as , formerly called advanced features (i.e., they have been derived evolutionarily from ancient features). One recent (highly derived ) feature in the asters is a . The terms "primitive" and "advanced" are avoided in that they imply inferior and superior."